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<title>Shadow DOM Test: Upper-boundary encapsulation: document's DOM tree accessors</title>
<link rel="author" title="Aleksei Yu. Semenov" href="mailto:a.semenov@unipro.ru">
<link rel="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
<link rel="author" title="Mikhail Fursov" href="mailto:mfursov@unipro.ru">
<link rel="author" title="Yuta Kitamura" href="mailto:yutak@google.com">
<link rel="help" href="http://www.w3.org/TR/2013/WD-shadow-dom-20130514/#upper-boundary-encapsulation">
<meta name="assert" content="Upper-boundary encapsulation: The shadow nodes and named shadow elements are not accessible using shadow host's document DOM tree accessors.">
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// A document's "DOM tree accessors" include:
//   (document.)head, title, body, images, embeds, plugins, links, forms,
//   scripts, getElementsByName(), cssElementMap, and currentScript
//
// Of these, it is unclear how document.cssElementMap can be tested.
// Except for it, there is a test corresponding to each accessor.
//
// Additionally, there are obsolete accessors
// <http://www.whatwg.org/specs/web-apps/current-work/multipage/obsolete.html#other-elements,-attributes-and-apis>:
//   (document.)anchors, applets, and all.
//
// and some accessors defined in the DOM specification (formerly known as
// "DOM Core") <http://dom.spec.whatwg.org/#interface-document>:
//   (document.)documentElement, getElementsByTagName(),
//   getElementsByTagNameNS(), getElementsByClassName(), and getElementById().
//
// As it seems reasonable to have tests for these accessors, this file also
// includes tests for them, except for document.documentElement which is
// unclear whether we can test; the distribution process of Shadow DOM does not
// alter the host element, so the document element (e.g. <html>) cannot be
// replaced with an element in a shadow tree.

// ----------------------------------------------------------------------------
// Constants and utility functions

// Place the same HTML content into both the host document and the shadow root.
// To differentiate these two, a class name is assigned to every element by
// populateTestContentToHostDocument() and populateTestContentToShadowRoot().
var HTML_CONTENT = [
    '<head>',
    '<title></title>',
    '<link rel="help" href="#">',
    '</head>',
    '<body>',
    '<p></p>',
    '<a name="test-name"></a>',
    '<a href="#"></a>',
    '<area href="#">',
    '<img src="#" alt="">',
    '<embed></embed>',
    '<form></form>',
    '<script><' + '/script>',
    '</body>'
].join('\n');

function addClassNameToAllElements(document, root, className) {
    var nodeIterator = document.createNodeIterator(
        root, NodeFilter.SHOW_ELEMENT, null);
    var node;
    while (node = nodeIterator.nextNode())
        node.className = className;
}

function populateTestContentToHostDocument(document) {
    document.documentElement.innerHTML = HTML_CONTENT;
    addClassNameToAllElements(document, document.documentElement, 'host');
}

function populateTestContentToShadowRoot(shadowRoot) {
    shadowRoot.innerHTML = HTML_CONTENT;
    addClassNameToAllElements(shadowRoot.ownerDocument, shadowRoot, 'shadow');
}

function createDocumentForTesting() {
    var doc = document.implementation.createHTMLDocument('');
    populateTestContentToHostDocument(doc);
    var shadowRoot = doc.body.attachShadow({mode: 'open'});
    populateTestContentToShadowRoot(shadowRoot);
    return doc;
}

// Make sure the given HTMLCollection contains at least one elements and
// all elements have the class named "host". This function works well with
// HTMLCollection, HTMLAllCollection, and NodeList consisting of elements.
function assert_collection(collection) {
    assert_true(collection.length > 0);
    Array.prototype.forEach.call(collection, function (element) {
        assert_equals(element.className, 'host');
    });
}

// ----------------------------------------------------------------------------
// Tests for DOM tree accessors defined in HTML specification

test(function () {
    var doc = createDocumentForTesting();
    assert_equals(doc.head.className, 'host');
    assert_equals(doc.body.className, 'host');
},
    '<head> and <body> in a shadow tree should not be accessible from ' +
    'owner document\'s "head" and "body" properties, respectively.'
);

test(function () {
    var doc = document.implementation.createHTMLDocument('');
    populateTestContentToHostDocument(doc);

    // Note: this test is originally written to replace document.documentElement
    // with shadow contents, but among Shadow DOM V1 allowed elements body is the
    // most approximate to it, though some test may make lesser sense.
    var shadowRoot = doc.body.attachShadow({mode: 'open'});
    populateTestContentToShadowRoot(shadowRoot);

    // Replace the content of <title> to distinguish elements in a host
    // document and a shadow tree.
    doc.getElementsByTagName('title')[0].textContent = 'Title of host document';
    shadowRoot.querySelector('title').textContent =
        'Title of shadow tree';

    assert_equals(doc.title, 'Title of host document');
},
    'The content of title element in a shadow tree should not be accessible ' +
    'from owner document\'s "title" attribute.'
);

function testHTMLCollection(accessor) {
    var doc = createDocumentForTesting();
    assert_collection(doc[accessor]);
}

generate_tests(
    testHTMLCollection,
    ['images', 'embeds', 'plugins', 'links', 'forms', 'scripts'].map(
        function (accessor) {
            return [
                'Elements in a shadow tree should not be accessible from ' +
                'owner document\'s "' + accessor + '" attribute.',
                accessor
            ];
        }));

test(function () {
    var doc = createDocumentForTesting();
    assert_collection(doc.getElementsByName('test-name'));
},
    'Elements in a shadow tree should not be accessible from owner ' +
    'document\'s getElementsByName() method.'
);

// ----------------------------------------------------------------------------
// Tests for obsolete accessors

generate_tests(
    testHTMLCollection,
    ['anchors', 'all'].map(
        function (accessor) {
            return [
                'Elements in a shadow tree should not be accessible from ' +
                'owner document\'s "' + accessor + '" attribute.',
                accessor
            ];
        }));

// ----------------------------------------------------------------------------
// Tests for accessors defined in DOM specification

test(function () {
    var doc = createDocumentForTesting();
    assert_collection(doc.getElementsByTagName('p'));
},
    'Elements in a shadow tree should not be accessible from owner ' +
    'document\'s getElementsByTagName() method.'
);

test(function () {
    // Create a XML document.
    var namespace = 'http://www.w3.org/1999/xhtml';
    var doc = document.implementation.createDocument(namespace, 'html');
    doc.documentElement.appendChild(doc.createElementNS(namespace, 'head'));
    var body = doc.createElementNS(namespace, 'body');
    var pHost = doc.createElementNS(namespace, 'p');
    pHost.className = "host";
    body.appendChild(pHost);
    doc.documentElement.appendChild(body);

    var shadowRoot = body.attachShadow({mode: 'open'});
    var pShadow = doc.createElementNS(namespace, 'p');
    pShadow.className = "shadow";
    shadowRoot.appendChild(pShadow);

    assert_collection(doc.getElementsByTagNameNS(namespace, 'p'));
},
    'Elements in a shadow tree should not be accessible from owner ' +
    'document\'s getElementsByTagNameNS() method.'
);

test(function () {
    var doc = document.implementation.createHTMLDocument('');
    populateTestContentToHostDocument(doc);
    var shadowRoot = doc.body.attachShadow({mode: 'open'});
    populateTestContentToShadowRoot(shadowRoot);

    shadowRoot.querySelectorAll('p')[0].id = 'test-id';
    assert_equals(doc.getElementById('test-id'), null);
},
    'Elements in a shadow tree should not be accessible from owner ' +
    'document\'s getElementById() method.'
);
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